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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/9435

Title: Increased accumulation of anthocyanins in Fragaria chiloensis fruits by transient suppression of FcMYB1 gene
Authors: Salvatierra, A.
Pimentel, P.
Moya-Leon, M.A.
Herrera, R.
Keywords: White strawberry
Fragaria chiloensis ssp chiloensis
Fruit color
RNAi silencing
Flavan 3-ol
Issue Date: Jun-2013
Citation: PHYTOCHEMISTRY Volume: 90 Pages: 25-36 DOI: 10.1016/j.phytochem.2013.02.016
Abstract: Anthocyanins and proanthocyanidins (PAs), flavonoid-derived metabolites with different physiological roles, are produced by plants in a coordinated manner during fruit development by the action of transcription factors (TFs). These regulatory proteins have either an activating or repressing effect over structural genes from the biosynthetic pathway under their control. FaMYB1, a TF belonging to the R2R3-MYB family and isolated from commercial strawberry fruit (Fragaria x ananassa), was reported as a transcriptional repressor and its heterologous over-expression in tobacco flowers suppressed flavonoid-derived compound accumulation. FcMYB1, an ortholog of FaMYB1 isolated from the white Chilean strawberry (Fragaria chiloensis ssp. chiloensis f. chiloensis), showed higher transcript levels in white (F. chiloensis) than in red (F. x ananassa cv. Camarosa) fruits. In order to assess its contribution to the discolored phenotype in F. chiloensis, FcMYB1 was transiently down-regulated in planta using an RNAi-based approach. Quantitative real-time PCR on FcMYB1 down-regulated fruits resulted an up-regulation of anthocyanidin synthase (ANS) and a strong repression of anthocyanidin reductase (ANR) and leucoanthocyanidin reductase (LAR) transcript accumulation. In addition, these fruits showed increased concentrations of anthocyanins and undetectable levels of flavan 3-ols. Altogether, these results indicate a role for FcMYB1 in regulation of the branching-point of the anthocyanin/PA biosynthesis
Description: Salvatierra, A (Salvatierra, Ariel) ; Moya-Leon, MA (Alejandra Moya-Leon, Maria); Herrera, R (Herrera, Raul). Univ Talca, Inst Biol Vegetal & Biotecnol, Talca, Chile
URI: http://dspace.utalca.cl/handle/1950/9435
ISSN: 0031-9422
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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